664136785201 has 4 divisors (see below), whose sum is σ = 670343671152. Its totient is φ = 657929899252.

The previous prime is 664136785199. The next prime is 664136785241. The reversal of 664136785201 is 102587631466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664136785201 - 2¹ = 664136785199 is a prime.

It is a super-2 number, since 2×664136785201² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664136785241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3103442815 + ... + 3103443028.

It is an arithmetic number, because the mean of its divisors is an integer number (167585917788).

Almost surely, 2^664136785201 is an apocalyptic number.

It is an amenable number.

664136785201 is a deficient number, since it is larger than the sum of its proper divisors (6206885951).

664136785201 is a wasteful number, since it uses less digits than its factorization.

664136785201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6206885950.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 664136785201 in words is "six hundred sixty-four billion, one hundred thirty-six million, seven hundred eighty-five thousand, two hundred one".